Drafting machine



Oct. 7, 1941. c.`w. KEUFFEL DRAFTING MACHINE Original `Filed April 24, 19557- 2 Sheets-S'heel. l

INVENTOR @933ml M ATTORNEYS l "nu".

0a. 7, 1941.` C, w, KEUHFFEL l 2,258,293

DRAFTING MACHINE Original Filed April 24, 1937 2 Sheets-Sheet 2 F IGA:

FIG. 2.

ne. a.

' ATTORNEYS Patented Oct. 7, 1941 UNITED- STATES i nltarj'rING M AonINE i" Carl W1Keuifel, vl/Veehawken, N. J., assigner Ato Keuiel & Esser' Company, Hoboken, N. J., a corporation of New Jersey original:applicationnprn 24, 1937, serialvno:

` x 1,138,759.` Dividedand this applicationJuly 1',

, y l1939, Serial No. 282,549 i solaires, f (o1. 33--795 iThis,inventionrelatesbroadlyto parallel mot-ion, drafting devices `of theklnd in `which `the several tools which the draftsman handles most frequently areembodied; in principle, in one unit to'obviate the,necessity of :a Idraftsman reaching about for a required tool,.thereby"en` abling the draftsman` to keep his attention concentrated directly upon the drawing. More particularly the invention'relates to so-called anchorsf forsuch drafting devicesfl 1 Drafting devices o1'.` this` character have heretofore been proposedin which the adjacent ends of two arms are pivoted together, the free end of one arm being secured to the remote side of a drafting boardwhilethe` free 'end of theother armis providedfwitha protractor and straight edges which are in Vfixed `angular-relation `to move aboutthe center of the protractor as an axis. Such .straight-edges have heretofore been so;` associated with` the protractor as to beset andlocked atiany'angle of the protractor or to be automatically stoppedat predetermined intervals. The straight edges of drafting devices of this type have been maintained inthe del sired relation to theldrawing board irrespective of the angularity ofthe arms by means of end-` less bands embracing pulleys of the three movable joints l of the construction.

This application is a division `of UnitedStates i application `Serial No.` 138,759 filed April 24,1937. 'l Itis an object of the inventionto provide for an adjustment'of one of the pulleys about which,

one* of the endless bands passes `whereby the straightdges may be caused to conform to lines already existing on the drawings. The Vinvention also 'seeks improved adjustnientsmforthe hinge connection atthe Aanchoring point 'i0 permit leveling l of respect to the board; ,n Yetlaffurther object of the invention is to provide adjustability of the angle of inclination of a the instrument with fixed pulley with respect toits pivotal axis` in a horizontal plane; l

.The vention also `resides `fin` the details of construction by which a drafting device is pro- 4, videdfwhich is practical from .the standpoint of ease andv convenience in manufactureandv durav Y bilityand4 yfacility in user;

'Ifhese .andf other Vobjects of the invention,andA

the ,meansMfor their Aattainment will be more apparent from the following detailed description taken in connection`- with the accompanying drawings illustrating one embodiment by which the invention may be realized, and in which:

Figure 1 is a viewhshowing the drafting device of this invention, in plan;

Figure 2 isa transversevertical sectional view,

indicated by the line 4-4 of Figure 1, looking in the direction of the arrows,

Referring first to Figure 1, it willbe noted that the drafting device of this invention comprises two arms indicated generally at I6 and I8, re-

spectively, whereof the adjacent ends of the re` spective arms arepivoted as at 'the point 20. The arm I6 is also pivoted, as at 22, at its free end to a fixed anchor member indicated generally at 24, by which the device is mounted on the drawing board, a fragmentary portion of which drawing board is indicated by the numeral 26. Mounted on the free end of the arm I8, as at 28, is the protractor 3IJ. A knob 32 is turnablerelativeto the end of the arm I8 about the pivot 28 ,to adjust the `'position of straight edges 29 with respect thereto. l

Eachof the arms I6 and` I8 consists generally of a pair of spaced channeled shaped connecting members. Between the connecting members of arm I6`is a top wall defining a space therewithin for a so-called fixed pulley 50.

Referring now to the vend of the member I6 containing the pulley 50, that is, the end of the arm IB at the right in Figure 1. This structure is shown as mounted upon an anchor member with provision for movement about a vertical axis, the -anchor member Abeing indicated gen'-y erally by the numeral 24. This anchor member is adapted to be clamped to the remote edge, preferably, of the drafting board 26, as shown in Figure l, the clamping means being shown in Figure 3. Conveniently, a bracket consisting of a flat surface 63, to rest on the top face of the drawing board, is provided with a downwardly depending positioning wall surface `64 lying in a plane at right angles to the lower surface of the member 63 so that :it can be placed on a drawing board and fit with relative accuracy. This bracket is formed at its lowermost portion with threaded bosses 66 through which pass the clamp zlxf .Y screws 6'I by which the bracket may be rigidly mounted on the drawing board or drawing table. Such board or table may be firmly clamped between the surface 63 and the heads 68 of the clamp screws.

Above the table member 63 rise two spaced bearing members 16, `each formed with a hemispherical recess'I I Vina horizontal line. To these bracket members or bearings 'I0 is pivotallyV mounted the adjustable arm or plate 'I3 which'- pivotally supports the free end of the armH |16-, j

This plate is really a bifurcated member having the spaced arms 'I4 and "I5, Figure l,

pivots as shown in Figure The pivot in one of the arms, say the arm 15,

formed Y is shown as a screw I6 withajround point I1 on the axis of the screw adaptedy to' be received? inf! rpolygonal portion 82 integra-lwith the screw 88V toy change` the eccentri'cty oi the` rounded point 83, thereby raisingl or loweringthe'arm Tfand thereby permitting levelling .of the: plate I3, itA being'possible, for instance, .asshown in Figure 3, to offset thelarmftfi through an.` angularity in-i4 dicated', say,V by the ,broken lines,` A and B off' that gure. f

The plate t3;d ligurfeff,- which may take any Y form so long asyit hasthe desired strength andi rigidity, is formed at a.; convenientpoint"v remote from the-,pivot ends-,M and [15 with a centrar bearing' portion 8.5 receiving: races 8.6 for' antifriction bearingsl $31` which support the ApivotA pin-` 22 abol-ltthev axis oi-whichf arm It turns; The lined pulley 5 6 turns, in adjustment,y on a cyl-in-j dricalsurfacetllcifY theplata.'I'3.

The xed' pulley 58 isv provided; with; an

recessed;y i

of a drawing already made. This is accomplished by inserting a thin adjusting pin in the capstan head clamping screw 98 and releasing the same. Then by taking the knob in one hand and the straight edges in the other, the straight edges may be shifted until they align with a base line of the drawing when thefa clamp screw 98 is again tightened:

, I'he height of the arms above the board may be Aadjusted so that the straight edges will lie flat urmrrtheV board. By inserting a thin adjusting pin in the capstan head screw |88 Figure 4, turn- `ing-'tins"scr-#evt in one'direction lowers the armsl towardfthe"boarcfwhereas turning it in the opposite direction raises the arms away from the board..-.Moreover,`by releasing the nut 8 I, the ec- .centricscrew 8Umay be rotated by means of a wrencI-i to raise-orilower the straight edges from therebelow has; integraly with ity an arm. 96 formed l withan elongated arcuate siotltconcentric' n A Y ',sf4whereof the, armsarespaced' a distance greater be shifted about its axis with ,respect tof the airis.`

offthearmA I6. Through theslot ;,92I Vpasses, a

locking screw whereby thefangular positirrrroi` the pulley may be' add-usted witlrirrfdesired i is translated tojthe straight edgess; n r1... l With the `pivot ,2A-2,'anchoredf en an. 'edgef of,

lst

boardlandwhere the boardv is levelP4 any movement f of the 'protractor tobring` the' straight edges tm' It will thuslbe seen that an anchor for a ing deslice has been provided; which may' be read:-

ily secured to the bacl; of the drawing table( by;

holding.r the vvertical.,bearing surface of tlfrean'-` chori against, the, rear edgfrof tha-board; and: se"- the drawing board. Between these two adjustments, the straight edges can be made to lie flat upon theboardew-hileno part ofthe arms or knee joints touches thefboardl except the supporting bosses under'the control knob. l Y

Various m'odications .wilt occur to those slollled in the artinathe composition, configuration and disposition of the component elements` going to make up the invention: as a: 'wholev as Well asin the. selection and combination of selectedV fea tures vto accomplish the: results sought, and no limitation is intendedi by the phraseology of the foregoing description :or :illustrations in". the`v accompari-ying,Y drawings except las. indicated in the` appended claims; f

Whatis claimed ist' 1. Ani anch-or for a parallel motion drafting. de-

vice-of the Wheel vand` band type 'comprising clamping means, a-support, means tospivotall'y' mount, the support on the clamping means to turn. about a horizontala axis, means` to. vary the- -ifiyrelative elevations fof the .pivoted mounting means Withrespect to theclamping means conrprising an eccentrically mounted pivot, and av spaced. adjustable member to' position said sup portwith respect .toY said clamping. means.

' 2An anchor for a parallel; rmotion device of thewheeband ba-n'dl typeI comprising spaced 1 bearing: members clamping, means, formed, respectively,.with oppositely facing` lio-rizontally aligned recesses, a biiurcated-support than f txa'aringf.Y'v members, Vsaid arms being formed, respectivelywith` horizontallydisposed threaded passages,.a screw in onepassfgewhereof the end' is disposed in. the recess of one: beard in'g member, a' screw in. the. other passagasaid g last named screw being, formed witlzpl.Y a. polygonal portion. and', an end integral with.- .the polyg m,f,,1,V portion. and eccentric to the.A screw axis. for/ref.

ceptioni'n therece'ss of the other bearngfmemtber, and a,V spaced adjustable memberlto position any Ndesired working; position will var-y the angu'.; lauritybetween the-two arms I6 IB but by draftsai'd" support with` respect to' said'clamping; means.-

3; Anancholffora parallel 'motion drafting 'd'e vicev of the wheei and bandtype .GOmDrsing a `table member adapted Vto be attached to the'surlface of! a drawing board: comprsing'twobearihg members in horizontal axialalignment,l ajsupia port tocarrytl-"iearmy ora d'raftingdevice'J pivotedy V tol said3 bearing members on horizontai axis' at two points, one of said-points being eccentria mwcally aditustabl and :af-spaced* adustable member curely tightening. the clamp screws.v Aga-in'` the,

straight edges. may bel aligned to the Ybase line:

engaging sardi-table member 'for positionlng'sai'di supporti with; respect. to 'saidltable member;- 

